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package dbhandler;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

public class SecureAlgorithm {

    public static String generateRandom() throws Exception {
        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
//System.out.println ( "SecureRandom : " + sr.nextInt () ); //if you enable then output return in negative
        return String.valueOf(Math.abs(sr.nextInt()));
    }

    public static String[] sanitizedData(String... input) {
        String sanitizedData[] = new String[input.length];
        int index = 0;

        for (String i : input) {
            sanitizedData[index++] = i.replaceAll("[\'~!@#$%^&*()\";: <>?/,.]", "’");
        }
        return sanitizedData;
    }

    private static String convertToHex(byte[] data) {
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < data.length; i++) {
            int halfbyte = (data[i] >>> 4) & 0x0F;
            int two_halfs = 0;
            do {
                if ((0 <= halfbyte) && (halfbyte <= 9)) {
                    buf.append((char) ('0' + halfbyte));
                } else {
                    buf.append((char) ('a' + (halfbyte - 10)));
                }
                halfbyte = data[i] & 0x0F;
            } while (two_halfs++ < 1);
        }
        return buf.toString();
    }

    public static String SHA1(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest md;
        md = MessageDigest.getInstance("SHA-1");
        byte[] sha1hash = new byte[40];
        md.update(text.getBytes("iso-8859-1"), 0, text.length());
        sha1hash = md.digest();
        return convertToHex(sha1hash);
    }

    public static void main(String args[]) {
        String sanitizedData[] = SecureAlgorithm.sanitizedData("vijay\'~ !@#$%^&*()\";:<>?/,.", "jessy%");
        System.out.println(sanitizedData[0] + "\n" + sanitizedData[1]);
    }
}